Electric transformer.



PATENTED JUNE 16, 1908.

L. MAIGHEL ELECTRIC TRANSFORMER. -APPLIOATION FILED SEPT. 25, 1907.

short,

invention is characterized by ATENY QFFIE.-

LOUIS MAIOHE, OF PARIS, FRANCE.

ELECTRIC TRANSFQRMEE.

Specification of Letters- Patent.

Patented June 16, 1908.

Application filed September 2-3, 199?", Serial No, 334,213.

To all whom it may concern:

Be it known that I, LOUIS MArcnE, a citizen of the French Republic, residing at Paris, France, have invented certain new and useful Improvements in Electric Transformers, of which the following is a specification.

This invention relates to electric transformers the construction of which is improved so that currents of induction of very short periodicity are obtained. The cur-- rents, the duration of which is extremely ossess special properties which are particularly useful when applied in telegra hy and in wireless telephony.

lhe electric transformer as per the present the absence of a magnetic core and by the arrangement that the primary and secondary windings form a 001. of little length but of very large diameter, the primary winding being, so to say, drowned in the secondary winding.

In the accompanying drawing an electric transformer according to the resent invention is shown diagrammatical y and by way of example.

Figure 1 is a section on line AB of Fig. 2 and Fig. 2 is a ground plan of the transformer.

As can be seen from the drawings, the transformer a is of ver large diameter whicl'i could he up to several meters; in the draw ing the transformer is represented of circular cross section; it could however he of souare cross section or of any other suitable phlygonal shape. This transformer is very short because all the wires of the winding are 10* cated on its periphery in an appropriate hollow or groove 5. One begins to place around the folly of this kind of wheel or disk a first layer of secondary wire 0 which is covered by a suitable insulator d and u on this insulator the primary wire 6 is woun which is covered by another layer of insulating material The two insulating layers d and f are connected in such a manner that the primary wires e are well insulated and the coil is finished by an outer winding of secondary wire g. In this manner a ring of lar e diameter is obtained which is compose of the secondary wires 0, g which inclose a core of.

suitably insulated primary wires e.

lhe apparatus comprises four terminals h, two of which serve for fixing the ends of the secondary winding, the other two serving for fixin the ends of the primary winding.

W at I claim as my invention is An electric transformer without magnetic core, of little length but of havin the primary winding secondary windin in testimony W ereof l have hereunto set my hand in presence of two subscribing witnesses.

inc osed in the LOUIS MAICHE.

lar -e diameter, 

